What is 121 highway?

As an AI language model, I don't have access to information that is specific to a particular place or country. However, there are several 121 highways across different countries and states around the world.

For example, in the United States, there is a Highway 121 in Texas, which connects major cities like Dallas and Fort Worth. It is a major commuter and commercial route, with four-lanes in most areas.

In India, there is a National Highway 121, which connects the cities of Kanpur and Jhansi in the state of Uttar Pradesh. It is a single-lane road and is an important route for people traveling between these two cities.

In France, there is a Departmental Route 121, which connects the villages of Saint-Germain-Laval and Saint-Louis in the Jura region. It is a small, two-lane road that passes through picturesque forests and countryside.

Overall, the properties and characteristics of the 121 highway may vary depending on the location and country it is located in.